Efeito de bebidas ácidas sobre rugosidade de superfície e alteração de cor em dentes artificiais e resinas acrílicas para base protética

• Autor(a) principal: Vilela, Geovana Costa [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156644; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-12/000900800.pdf
• topic: Prótese total; Resinas acrílicas; Teste de materiais; Dente artificial; Cor; Denture, Complete

Some drinks, such as soft drinks, artificial or natural juices and wines, in general, are considered acidic, since they have a pH of less than 5, and may be responsible for the degradation of artificial teeth and acrylic base of prostheses, inducing the color changes, the wear and surface irregularities, reducing therefore the useful life of the prosthesis. The objective of this research was to evaluate in vitro the effect of four acidic drinks commercially available and their possible consequences on change of roughness and color of two brands of artificial teeth and a thermally-activated acrylic resin (RAAT) for use in prosthetic base. Both RAAT samples as artificial teeth divided into 5 groups according to the acidic drink used (dry red wine, industrialized orange juice, soda and cola-based and soft drink lemon juice based) and the control group (saliva artificial). The pH of drinks was assessed before each immersion, with the aid of bench pH meter. The change of the surface (Ra) of the samples was evaluated in roughness tester, and the color change (Δ E), in the spectrophotometer, before and after the immersions. The simulation of the daily consumption of these beverages accomplished by immersing the specimens in each solution, for 10 minutes, during 15 days. In a second moment, after the daily immersion in acidic drinks, were the samples subjected to immersion in grape juice for a period of 15 days, to assess whether the solutions would contribute to later staining. The data obtained were subjected to the test of adherence to the normal curve in order to determine whether they were or not of a normal distribution. As the data showed a normal distribution, the analysis of variance ANOVA was applied, being the two factors for repeated measures, for roughness and a test for repeated measures single factor, for the test of color change. In cases...